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-rw-r--r--lib/PublicInbox/MID.pm3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 786c056f..4ccb704d 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -68,6 +68,9 @@ sub uniq_mids {
 }
 
 sub mids { uniq_mids($_[0], 'Message-Id') }
+
+# last References should be IRT, but some mail clients do things
+# out of order, so trust IRT over References iff IRT exists
 sub references { uniq_mids($_[0], 'References', 'In-Reply-To') }
 
 # RFC3986, section 3.3: